Cosmos
Cosmos spp.
Cosmos flower (species unknown) by Gary Gerbrandt (CC BY-SA 3.0)
Full Sun
Easy care
Moderate watering
Tender
H4-H1c
RHS hardiness
-10°C
Minimum temperature
Expected size
Height | Spread | |
|---|---|---|
1.5m | Max | 30cm |
30cm | Min | 20cm |
Flowering
-
spring
-
summer
-
autumn
-
winter
More images of Cosmos
Cosmos Overview
Cosmos is a genus of over 40 annual and tuberous perennial or annual species originally from the scrublands and meadows of the Southern USA and Central America. Cosmos is very popular with gardeners and is grown and cultivated extensively for its large, showy, daisy-like blooms that are borne on long stalks in summer. The flowers can be saucer, bowl or cup-shaped and of a wide variety of colours. The leaves, which always appear as opposite pairs, are of different shapes, depending on species or cultivar. Easy to grow, cosmos are most often seen spreading in drifts across sunny flower beds and borders. They like moderately fertile, moist, well-drained soil.
Common problems with Cosmos
Cosmos Companion Plants
Tomato
Solanum lycopersicum
Beetroot
Beta spp.
Vervain
Verbena spp.
Canna Lilies
Canna spp.
Marigold
Tagetes spp.
Marigold
Calendula spp.
Montbretia
Crocosmia spp.
Carnation
Dianthus spp.
Sneezeweed
Helenium spp.
Poppy
Papaver spp.
Spider flower
Cleome spp.
Zinnia
Zinnia spp.
Tobacco Plant
Nicotiana spp.
Dahlia
Dahlia spp.
Hardy Geranium
Geranium spp.
Catmint
Nepeta spp.
Meadow Rue
Thalictrum spp.
Tickseed
Bidens spp.
Sea Holly
Eryngium spp.
Coneflower
Echinacea spp.
Lavender
Lavandula spp.
How to propagate Cosmos
Seed
Cuttings
You can propagate the half-hardy species by basal cuttings in the spring, the annuals by seed in the autumn or spring.
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